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zephyr-cp: add the Circuit Playground Bluefruit - #11657
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mikeysklar merged 3 commits intoOct 23, 2026
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…ruit Points at the open PRs adafruit/zephyr#9 (board definition) and adafruit/adaboot#13 (partition layout) until they merge. Their commits are only reachable from the pull request refs, which west can fetch by name but not by SHA. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Pin names come from the nordic port board. The partition layout, the same as the CLUE, comes from adaboot. Changes from the CLUE board: - No display, so SPI2 is a second dynamic SPI instance. - No STEMMA QT connector. - Pin numbers are nRF52840 aQFN73 package pins: the board has a bare nRF52840, not a module. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
adafruit/zephyr#9 and adafruit/adaboot#13 have merged, so point at their merge commits instead of the pull request refs. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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October 23, 2026 20:10
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Tested on a Circuit Playground Bluefruit with a TFT Gizmo attached.
| Test | Result |
|---|---|
| pin map | all 46 names match ports/nordic, each resolves to the commented pad |
| CIRCUITPY | 2,072,576 bytes, existing files kept |
LED, BUTTON_A, BUTTON_B, SLIDE_SWITCH |
ok with digitalio and keypad |
board.I2C() + accelerometer bus at once |
LIS3DH WHO_AM_I 0x33 |
board.SPI() + second busio.SPI at once |
ok |
TFT Gizmo, fourwire + busdisplay ST7789 |
test pattern correct |
neopixel_write |
all 10 pixels |
pwmio on SPEAKER |
440/880 Hz tones play |
analogio LIGHT, TEMPERATURE |
read |
_bleio advertising |
seen by a Linux host |
on_next_reset(RunMode.UF2), 1200-baud touch |
both reach CPLAYBTBOOT |
Looks good to me.
These port-wide gaps showed up in testing. They are not specific to this board and should not hold up this PR:
microcontroller.cpu.temperatureis always0.0. It is hard-coded incommon-hal/microcontroller/Processor.c.microcontroller.cpu.frequencyreturns32768on nRF52840. The cpu node has noclock-frequency, so it falls back toCONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC.storage.disable_usb_drive()inboot.pyraisesRuntimeError: Cannot change USB devices now. The MacroPad does the same.usb_midiis not enabled.
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Board definition and testing by Claude.
Add
adafruit_circuitplayground_bluefruit_zephyrboard.ports/nordicboard.board.overlayis like the CLUE's, except:Testing
Tested on a Circuit Playground Bluefruit:
digitalio:LED,BUTTON_AandBUTTON_BandSLIDE_SWITCHwere tested.neopixel_writesets all 10 NeoPixels.board.I2C()andbusio.I2C(board.ACCELEROMETER_SCL, board.ACCELEROMETER_SDA)were created at the same time. The LIS3DH answers at0x19.board.SPI()and a secondbusio.SPIwere created at the same time.board.UART()writes.analogioreadsLIGHTandTEMPERATURE.pwmioplays a tone onSPEAKER, withSPEAKER_ENABLEhigh._bleioadvertising is seen by a host.As on the other zephyr-cp nRF52840 boards, a board with a W25Q16JV flash chip instead of a GD25Q16C gets no CIRCUITPY. See the notes in adafruit/zephyr#9.